Star formation rate reconstructed with our parametric model from the luminosities of a synthetic Gaussian SFR with different peak ages (increasing from top to bottom) and FWHMs (increasing from left to right), compared to the input model (solid black line). Colour gradients and line styles indicate the degree of the polynomial reconstruction from N = 5 (solid) to lower degrees (more diffuse lines; solid and dashed for odd and even N). Red crosses correspond to the best positive-SFR fit.